Ignition magneto



July 5,1921. 1,634,575

W. W. HAWKYINS IGNITION MAGNETO Filed Feb, 20, 1922 z sheets-snm 1 July 5,1921. v

W. W. HAWKINS IGNITION MAGNETO Filed Feb. 20, 1922 2 Shoots-Sheet 2 Patented July 5', 1927.

UNITED STATES PATENT oFF 1,634,575 ICE.

WILLIAM W. HAWKINS, OF BROOKLYN, NEW YORK, ASSIGNOR T WEBSTER ELECTRIC COMPANY, OF RACINE, WISCONSIN, A CORPORATION OF WISCONSIN.

IGNITION MAGNETO.

Application led February 20, 1922. Serial No. 537,992.

This invention relates to magnetos of the type used for ignition purposes withinternal combustion engines, and particularly to niagnetos of the oscillator type.

T he object of the present invention is the provision of a magneto and circuit connections therefor, by means of which a spark of high intensity will be produced.

-In the drawings which disclose one speciiic embodiment of the invention Figure 1 is an end View of the device suchl as would be obtained by looking at Figure 3 4:from above; l

FigureQ shows a section through the devvice at. one side of the magnet and pole pieces; y

Figure 3 is a section substantially on the line 3-3 of Figure 2, looking in the' direc.

tion of the arrows; 2o

pole pieces and the inductor inductor rotated to its cocked tion, and

Figure 5 is a diagram schematically indishowing the or set posieating the circuit connections. v In magnetos of the type herein disclosed, i

it is usual to provide means driven by moving parts of the engine or motor, by means of which the rotor shaft is moved to a cocked or set position,and then tripped oil', resilient means being provided to cause the rapid return of the rotor to its normal position after U-shaped ,or horseshoe magnet. In contact with the leg 11 of the magnet 10 is the pole piece consisting of the legs 12 and 13. In engagement with the leg 14 of the magnet 1() is a pole piece comprising the legs 15 and 16. Extending upwardly from the leg 16 is an arm 17 in engagement'with which is the core piece l18. Wound about the core- 18 is the primary coil 19 and the secondary coil 20 of a transformer. Positioned opposite the Figure 4Vis a detached View of the magnet pole piece 16 is an auxiliary pole piece 21 provided with an upwardly extending arm 22 in engagement with the end of the core 18 remote from the upright l It is to be understood that the part 17, core 18 and parts 21 and 22 .are all formed of magnetizable material, in the usual manner. It` should alsol be noted that while the part 21 is located on the same side of the rotor as the legs l2 and 13, it is insulated from the leg 11 of magnet 10 but is magnetically joined to the leg 16 through the core piece 18.

The rotor shaft is shown at 23. Non-rotatably secured to the shaft 23, in any de-v sired manner, is the inductor 24 formed of the usual magnetizahle material. It will be noted that one end of the inductor 24 is T- shaped so as to bridge the space between adjacent pole pieces 13 and 21. y

Non-rotatably secured to the end of the shaft 23, ine any desired manner, aslby the spline 25 and nut 26, is a yoke 27 provided with the oppositely extending arms 28. Each of the arms 28 is provided with an outward ly extending stud 29 which is arranged to be encircled by one end of a retractile spring 30, by means of which the rotor shaft is returned to its normal position after the rotoi` has been cocked. The ends of the springs 3() remote from the studs 29 are joined to studs 31 projecting outwardly from the frame of the magneto,

Secured to the end ofthe shaft 23 remote from the yoke 27 is a collar 31 provided with y Ian outwardly extending armr 32. Pivotally secured to the arm 32 by means of the pivot 33 is the cont-act actuating dog 34. Secured to the collar 31, as by the screws 35, is a spring 36 which engages the inner end of the dog 34` and ten-ds to normally maintain the dog in the position indicated in Figure 5. R'igidly supported by the screws 37,and hav- Aing its free end projecting into the path `of the dog, 34 is a bow spring 38. Pivotally mounted on the screw 3,9 is the arm 40 which is joined to the spring 38 by the screw 41. The'arm 40 at its end remote from the pivot 39 is provided with a. contact 42 which is adapted to engage the fixed contact 43 of the interrupter adjustably mounted in the clip 44.

lVound about the pole piece legs 13 and 15 are the coils 45 and 46, respectively. The coils 45 and 46 are in a vclosed circuit including the condenser 47. One side of the condenser 47 is permanently connected to l ground at 48. The other side of the condenser is connected to ground through the interrupter contacts 42 and 43, arm 40, and.

supporting screw 39 which enters the metallic portion or frame of the device.

One end of the primary coil 19 is grounded, and the other end of the coil is connected to the conductor 49, which joins the con-` denser to the end of the coil 46 remote from coil 45. The secondary coil 20 is grounded at .one end, the other being connected to a distributor, sparkl plug, or any desired device.

Having now described the arrangement of the several parts of myinventlon, the

.operation will now be described,

In following the operation, it should be kept in mind that the interrupter operating mechanism shown in Figures 1 and 5 is viewed from the opposite' direction to that of the rotor as viewed in Figures 2 and 4. In other Words, when read onthe drawings, when the rotor shait of Figures y2 and 4 rotates in a clockwise direction, the shaft andy interrupter l operating mechanism of V'Figures 1 and 5 will be rotated in a counter' release of the rotor, the armature will take' up a position substantially as indicated in Figure 2.

The rotor will Vbe cocked by moving the armature 24 in a clockwise direction, as viewed in Figure 4; AThis movement of the rotor shaft will result-in moving the interrupter arm 32 in a counterclockwise direction, as viewed in Figures 1 and 5. During this counter-clockwise movement of the arm 32, the outer end ofthe dog 34 will engage the free end of -the bow spring38 and will be rotated about its pivot pin 33 against the tension of spring' 36. Just before the rotor 'reaches its fully cocked position, `the dog 34 will ride oii from the end of the spring 38 and will be moved so as to extend radially from the shaft 23'.. The d? time be spacedavery short stance from the end ofthe bow spring 38.`

-Upon the `beginning of the return nievement of the rotor, the dog 34 will engage the end ofsspring 38, moving contact 42 into. en`

gagement with contact 43. Contacts 42 and 43 Y-will be held firmly in engagement by the resiliency in the free end of the spring v38 until the rotor shaft reaches substantially the position indicated in Figure 2, at whic time the dog will slip off from the end of the spring38 and permit the resiliency of the spring .38 to open the contacts 42 and 43.

During the return movement of the rotor in a counter-clockwise direction, the lux or magnetic lines assing through the pole piece legs 13 an l5 will change very rapid- 1y,'thus setting up an electrical impulse` in the windings 45 and 46. Due to the fact that the interrupter contacts are in engage- Ament at this time, the first part of this impulse will pass from ground 48, through the coils 45 and 46 in series, and through the interrupter contacts back to ground.

However, when the contacts 42 and 43 open as the rotor approaches the positionindicated in Figure 2, the path Ato ground through the interrupter contacts is opened, and the current must now flow to ground through the coil 19. Thus, an impulse of current is sent through the coil 19, whichis augmented by the discharge from the condenser 47, and is further augmented by the iiux or magnetic lines which are now flowing through the core 18 due to the fact that the Tl1eaded end of the rotor armature 24 is now bridging the space between the auxiliary pole piece 21 and the pole piece leg 13.

,It will be recalled that the auxiliary pole piece 21 is merely an extension of the pole piece 16, so the magnetic lines will now extend from the leg 140i the magnet 10, through pole piece 16,-arm 17, core 18, arm 22, auxiliary pole piece 21,'the head of the rotor- 24, and pole piece leg 13, to the other leg 11 of magnet 10. The surge of current through coil 19 brought about by the conditions above described produces a high potential impulse in the secondary winding 20 which will be effective to produce a spark of great intensity. f

While in the above'description but a single form of applicants device is disclosed, it is to be understood that many modifications in the speciiic details are contemplated and the invention, therefore, should be limited merely by the scope of the appended claims.

'What I claim is new and desire to secure by Letters Patent of the United States is:

l. In a magneto, a generating winding, a transformer comprising a primary coil and ra secondary coil, one end of said gen- 34 will at this erating winding being connected to one end of said primary coil, the opposite end of said generating winding being grounded and the opposite end of said primary coil being grounded, a bridge connected at oneiend to the. point of connection between said generatino winding and said. primary coil and 4the. other end being connected to ground,

and an interrupter in said bridge circuit, said secondary coil being connected at one end to the grounded end of said primary coil and at the other end being connected to the spark plug of the ignition system.

2. In a magneto, a pole piece, a generating winding thereon, a transformer including a. core and a coil thereon, means for creating a magnetic field, and a rotor arranged to first complete a path for the flow of magnetic lines or fiux through said pole piece for energizing said generating winding andl t0 subsequently complete a path for the fiow of flux through said core and pole piece in series for 4energizing said transformer coil.

3. In a magneto, a pole piece, a` generating winding thereon, a transformer including a core and a coil thereon, means for creating a magnetic field, one end of said transformer core being magnetically separated from said magnetic field, a rotor, and means for causing an oscillating movement of said rotor, said rotor being arranged to pieces in series.

complete a' path for the flow of magnetic lines .or flux through said pole piece during its initial operative movement and to subsequently complete a path for the flow of flux through said core and pole piece in series.

4. In a magneto, a magnet, a pair of pole pieces therefor, generating windings thereon respectively, a transformer including a core and a coil thereon, said core having a magnetically isolated end, a rotor arranged to complete a path for the How of magnetic lines or flux through said pole pieces durin its initial operative movement' and to su sequently complete a path for the flow of flux through the magnetically isolated end of said core and one of said pole pieces in series.

5. In a magneto, a magnet, a pair of pole pieces therefor, generating windin s thereon respectively, a transformer inc uding a. core having one lend separated from said pole pieces and a coil on said core, a rotor,

and means for causing an oscillating movement of said rotor, said rotor being arranged tocomplete a path for the flow of magnet-ic lines or flux through said pole pieces during its initial operative movement and to subsequently complete a -patlr for the flow of flux through said core and one of said pole 6. In a magneto, a pole piece, a generating winding thereon, a transformer including a core, a. coil on said core, means for creating a magnetic field, a rotor arranged to first complete a path 'for theyfiow of magnet-ic lines or flux through said pole piece and to subsequently complete a path for the flow of iux through said core and pole piece in series. a circuit including said winding and said coil, a ybranchfrom said circuit between said coil and winding, and an interrupter in said branch.

7.v In a magneto, a pole piece, a generating winding thereon, a transformer including a core, a coil on said core, means forv creating a magnetic` field, one end of said transformer core being magnetically'separated from said ma netic field, a rotor arranged to first comp ete a path for the fiow of magnetic lines or fiuX .through said pole piece and to subsequently complete a path arranged to first complete a path for the flow lof magnetic lines or flux through said pole pieces and to subsequently complete a path for the fiow of flux through said core and one of said pole pieces in series, a circuit includin said windings and said coil, a Ybranch 'om said circult between saidcoil /and said windings, and an interrupter in said branch.

9. In a magneto, a magnet, a-pair of pole pieces therefor, generating windings on said pole pieces respectively, a-ftransformer including a core having a magnetically isolated end, a coil on said core, a rotor, means for causing an oscillating movement of said rotor, said rotor being arranged to complete Y a path for the flow of magnetic lines or flux through said pole pieces during its initial operative movement kand to subsequently complete a 'path for the flow of fiuX through the. magnetically isolated end of said core and one of said pole pieces in series, a circuit including said windin s and said coil, a branch from said circuit etween said coil and said windings, and an interrupter in saidv branch. y p

n l0. In a magneto, a magnet, a pair of pole pieces therefor, generating windings on said pole pieces respectively, a transformer including a. core, a ,coil on said core, a rotor, means for causing an oscillating movement of said rotor, said rotor being arranged to complete a path for the flow of magnetic lines or flux` through said pole pieces during its initial operativeJ movement and to subsequently complete a path for the flow of fiux through the core and one of said pole pieces in series, a circuit including said windings. and said coil, a branch from said circuit between said coil and said windings, an interrupter in said branch, and a condenser in parallel with said interrupter.

11. In a magneto, a magnet, pole pieces therefor, generating windings on said pole pieces respectively, a branch from one of said pole pieces terminating in an auxiliary pole piece adjacent to the other one of said pole pieces, and a rotor arranged in one position to completea path for the fiow of fiux from one of said pole pieces to the other direct,

and in another position to complete a ath from said auxiliary pole piece to the a oresaid other one of said pole pieces.`

12. In a magneto, a magnet, pole pieces therefor, generating windings onsaid pole pieces respectively, a branch from one of said pole pieces, an auxiliar pole piece magneticall joined to said branch, said auxiliary po e piece lbeing adjacent to the other one of said pole pieces, and a transformer'V having alcoil wound about said branch.

13. In a magneto, a magnet, pole pieces therefor, generating windin s on said pole pieces respectively, a branc from one of said pole pieces terminating in an auxiliary pole piece adjacent to the other one of said pole pieces, a rotor arranged in one position to complete a path for the iiow of flux from onefof said pole pieces to the other direct, and in another position to, complete a path from said auxiliary pole piece to the said other one of said polepieces, and a transformer' having a primary coil wound about said branch. 1

14. In .a magneto, a magnet, pole pieces therefor, generating windings on said pole pieces respectively, a .branch from one of said pole pieces terminating in an auxiliary pole piece, a rotor arranged in one position tocomplete a path for the flow of flux from one of said pole pieces to the other direct, and in another position to complete a path from .said auxiliary pole piece to the said other one of said pole ieces, a circuit including said windifngsandJ coil, a branch circuit extendin from said circuit, and an interrupter in sai branch circuit.

15. In a magneto, a magnet, pole pieces therefor, generating windings on said pole pieces respectively, a branch from one of Said pole pieces terminating in an auxiliary pole piece, a rotor arranged when in `a substantially horizontal position to complete a path for the How of flux from one of said pole pieces to the other direct, and when in an inclined yposition to complete a path from saidY auxiliary pole piece to the said other `one of said pole pieces, a circuitincluding sald windings and coil, a branch c1rcu1t ex-` tending from said circuit between said coil and said windings, and an interrupter in said branch circuit.`

In witness whereof, I hereunto subscribe my naine this th day of January, 1922.

WILLIAM QW. yHAWKINS. 

